|Australian box jellyfish||Box jellies|
|Box jelly||Box jellyfish|
|Chironex box jellyfish||Indringa|
|Sea stinger||Sea wasp|
These tropical jellyfish are mainly found in coastal waters in tropical areas of northern Australia. These animals frequent the shore area adjacent to mangrove creeks in which they breed, and from which they swim to feed in summer (October to May). The closer the geographical location to the equator, the greater the number of months Chironex fleckeri
is found. In Darwin, Chironex fleckeri
stings have occurred for every month of the year, except for one month. When fishing for prey they favor calm water close to shore, free of snags over clear sandy bottoms, where they extend and trail their curtain of tentacles behind them.
Medical observation, preferably in an advanced care facility with Box Jellyfish Antivenom
available is recommended for:
- Any individual stung or suspected to have been stung by a box jellyfish
All patients require medical attention.
Asymptomatic patients should be observed for 2 hours. If they remain asymptomatic in this time frame, the patient may be discharged into the care of a reliable observer and given instructions to return should any symptoms develop.
Stings may result in severe envenoming; symptomatic patients must not therefore be discharged until their symptoms have subsided.
Sticky tape or scalpel sampling can be performed to identify the jellyfish in question, sticky tape is applied to skin or the skin is scraped with a scalpel and then transferred to a microscope slide for examination; this allows nematocysts to be identified on the basis of morphology.
However this currently is a research tool only. A negative result does not rule out a jellyfish sting.
Any patient with symptoms must be admitted to a medical facility with Box Jellyfish Antivenom
and advanced life support.
Most stings are minor but all must be treated as potentially lethal.
In all cases retrieve and restrain the victim on the beach, prevent rubbing of attached tentacles and vigorous muscular activity. Commence and sustain cardiopulmonary resuscitation (CPR) if indicated, this always takes absolute priority.
Flush the affected area liberally with vinegar for at least 30 seconds, and only then carefully remove any adherent tentacles.
If the effects are minor, pain may be managed with local application of ice,
simple analgesia, and oral antihistamines; there should be early medical inspection in case of local skin damage. If pain does not respond, parenteral opioid analgesia may be required, or administration of Box Jellyfish Antivenom
which appears effective for pain relief if administered early. Antivenom is also indicated in severe envenomings to reduce life-threatening complications, and possibly reduce scarring.
Cardiac dysrhythmia and arrest are particular concerns, and possibly may develop within minutes of the stinging contact. Pulmonary edema and respiratory depression/failure may subsequently evolve. Multiple vials of antivenom should be administered for these indications, but its efficacy in the management of cardiorespiratory dysfunction remains uncertain,
and advanced supportive care, including mechanical ventilation, is likely required to maintain such patients.
Dermonecrosis is a frequent complication of serious stings, and box jellyfish antivenom has been reported to improve both acute and long-term cutaneous damage.
Acute skin markings often resolve spontaneously. Thus acute dermonecrosis should be treated as a burn with specific attention to avoiding secondary bacterial infection. Delayed hypersensitivity reactions are a common late complication of stings occurring some 7 to 14 days after the event.
Serum sickness is a potential concern in those receiving antivenom, particularly multiple doses.
Ensure Adequate Cardiopulmonary Function
Ensure the airway is protected if compromised (intubation may be necessary).
Immediately establish secure intravenous access.
Cardiac dysrhythmia or arrest may occur within minutes of a sting – particularly in children. Commence and sustain cardiopulmonary resuscitation (CPR) if indicated, this takes priority over application of vinegar to neutralize tentacle stinging apparatus.
Cardiopulmonary resuscitation should therefore be prolonged, and ideally not abandoned until at least 6 vials of intravenous box jellyfish antivenom have been administered.
Hypotension in children is determined by age and systolic blood pressure
Hypotension if Systolic Blood Pressure (mm Hg) is:
0 to 28 days
1 to 12 months
1 to 10 years
< 70 + (age in years x 2)
> 10 years
Administer an isotonic crystalloid fluid
10 mL/kg IV over 5 to 10 minutes
If the systolic blood pressure does not return to the normal range, give a further 10 mL/kg body weight of the isotonic crystalloid over 5 to 10 minutes.
The intraosseous route can be used if IV access is difficult or delayed.
Administer a bolus of isotonic crystalloid fluid if systolic blood pressure is less than 100 mmHg.
Isotonic crystalloid fluid dose:
20 mL/kg IV over 5 to 10 minutes
If the systolic blood pressure does not return to the normal range, give a further 10 mL/kg body weight normal saline over 5 to 10 minutes.
The intraosseous route can be used if IV access is difficult or delayed.
Retrieve and restrain the victim on the beach and prevent tentacle rubbing and vigorous muscular activity. Immediately douse the sting area liberally with vinegar for a minimum of 30 seconds;
do not attempt to remove adherent tentacles before this step, unless no vinegar is available, in which case carefully pick off the tentacles.
Pressure Bandage with Immobilization First Aid
If there are signs of systemic envenoming:
Level of consciousness
Flush the affected area with vinegar (3 to 10 % acetic acid in water) as soon as possible,
and continue to irrigate for 30 seconds. After flushing, carefully remove any adherent tentacles.
Vinegar may irritate the sting sites, but should still be applied.
It is not designed to relieve pain associated with jellyfish stings, but to prevent further discharge of nematocysts. Nematocyst inhibition and analgesia are two distinct and separate areas of management.
The fresh sting area should never be rubbed with sand, towels or anything else. Methylated spirits is not recommended.
Remove contact lenses. Irrigate immediately with water or saline for at least 30 minutes. If the eye is contaminated with solid particles, the eyelid should be completely everted and any solid material removed as quickly as possible while continuing to irrigate the eye. A topical anesthetic is recommended to enable the patient to open their eyelids sufficiently for effective irrigation.
The eye should be examined immediately following flushing with a slit-lamp microscope and fluorescein stain. Any evidence of injury requires specialist ophthalmological assessment.
There have been conflicting studies over the efficacy of box jellyfish antivenom, its efficacy remains to be proven, particularly in relation to preventing fatalities. This is because of the dramatic nature of the sting, with death or survival usually determined within minutes.
Studies in animals have shown that the antivenom is largely ineffective in preventing cardiovascular collapse even when administered before envenoming;
this lack of effect may be due to the antivenom being unable to bind venom in sufficient time to prevent the venoms rapid effects.
Box Jellyfish Antivenom should be administered to any patient if:
- Cardiorespiratory dysfunction/arrest is apparent
- Severe pain is unresponsive to other managements
Other suggested, but not uniformly accepted, indications include:
- The total sting area is greater than the area equivalent to one half of one limb (especially in children)
- Cosmetic damage such as to the face is likely (the possible benefit must be carefully considered given the risks of antivenom administration)
However, these indications should be discussed with a medical toxicologist.
Only administer if clearly indicated. Note the dose for a child is the same as that for an adult.
Prior to use of jellyfish antivenom, ensure adequate resuscitation equipment is available for the management of anaphylaxis, and that an appropriate dose of epinephrine (adrenaline) is drawn up as outlined in management of anaphylaxis
. Note that anaphylaxis has not yet occurred with this antivenom and the need for early administration in severe cases may outweigh the need to be fully prepared to treat anaphylaxis.
Initial Box Jellyfish Antivenom dose
CHILD and ADULT
Life threatening cardiac or respiratory failure:
1 to 3 vials IV (if cardiac arrest, consider 6 vials undiluted as rapid IV push)
Systemic envenoming (collapse, hypotension, significant cardiac dysrhythmia):
1 vial IV
1 vial IV
Preferably dilute antivenom up to 1 in 10 in an isotonic solution (e.g. normal [0.9%] saline); dilution should be less for children due to fluid load. Administer intravenously via a drip-set, commence very slowly and increase rate if there is no adverse reaction. Total dose should be given over 15 to 30 minutes.
Patients must be closely monitored for anaphylaxis during and for 30 minutes after the infusion.
Further Box Jellyfish Antivenom doses
Should cardiovascular compromise not be reversed with the initial dose, it is recommend that advice from a medical toxicologist (at the bedside or through a Poison Center) is obtained regarding whether further antivenom therapy is required.
There is no absolute contra-indication to this potentially life-saving intervention.
Those at increased risk of severe reaction include patients with history of:
Previous reaction to antiserum
The antivenom being a foreign protein could cause sensitization and, therefore, should not be given for insignificant lesions or wheals.
Closely monitor the patient for indications of anaphylaxis including:
Serum sickness may occur some 4 to 14 days following antivenom administration.
Patients should be made aware of the signs and symptoms of serum sickness including:
If high doses of antivenom have been administered prophylaxis with an oral steroid such as prednisolone may be considered, and follow-up arranged. Commence prophylaxis on day 2 to 3 post envenoming.
1 mg/kg (up to 50 mg) per day orally for 5 days
50 mg per day orally for 5 days
SIGNS AND SYMPTOMS
Following exposure, the victim may experience immediate excruciating pain which increases in mounting waves, despite removal of the tentacle. The victim may scream and become irrational.
Areas of contact appear as purple or brown lines often compared to the marks made by a whip.
A pattern of transverse bars is usually visible and whealing is prompt and massive. Edema, erythema, and vesiculation soon follow and when these subside patches of full thickness necrosis are revealed.
Patients may develop a variety of systemic effects that include acute pulmonary edema, cardiovascular instability and dysrhythmias, hypertension, hypotension, shock, and cardiac arrest. When death occurs it is usually due to a (presumed) cardiac arrest on the beach.
Clinical effects may develop following contact with intact or dismembered jellyfish, or nets containing body parts. Exposures generally occur when people are swimming in the sea or when specimens are washed up on the beach and handled or stood on. Jellyfish do not “attack” humans and stings are usually the result of a creature drifting into humans or humans colliding into a jellyfish.
Onset/Duration of Symptoms
Local effects are generally noted immediately. Victims experience intense excruciating localized skin pain, peaking at 15 minutes and waning over the subsequent 24 hours; edema, erythema and vesiculation occur initially and when these subside (after some 10 days) patches of full thickness necrosis are revealed. Death, if it occurs, is usually within 20 minutes of the sting.
Severity is dependent upon area of discharging tentacle contact. Involvement of greater than 10% skin area is potentially lethal, especially in children. Death follows cardiopulmonary failure.
|Mild Box Jellyfish Envenoming||Moderate Box Jellyfish Envenoming||Severe Box Jellyfish Envenoming|
Cutaneous linear marks of sting
Severe local or generalized pain
Acute respiratory distress
Acute pulmonary edema
Delayed hypersensitivity reactions may occur in patients following stings. The reaction consists of a pruritic erythematous maculopapular rash that appears at the initial tentacle contact points and occurs 7 to 14 days after envenoming. The reaction may spontaneously resolve; most recover following treatment with oral antihistamines and topical corticosteroids.
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